Abstract
A microcapillary method was developed to measure the viscosity of small volumes of undiluted epididymal fluid. Fluid from the cauda epididymis registered 82 +/- 17 centipoise which was much more viscous than fluid from the caput region (8 +/- 2 centipoise). Initiation of sperm motility was strongly suppressed in the viscosity range of 7 to 150 centipoise. A significant increase in the viscosity of fluid from the caput region was observed when immobilin in the fluid binds with a lectin from Jack fruit (Artocarpus heterophyllus). Thus, it is postulated that aggregation of the immobilin induced by a lectin-like material produced by the cauda epididymis may be a mechanism by which fluid viscosity is increased during epididymal transit.
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